While some mammals like whales and dolphins have smooth skin, the vast majority have a coat of fur or hair that serves various purposes:
* Insulation: Fur and hair trap a layer of air close to the skin, providing warmth in cold environments.
* Protection: Fur and hair can protect against injuries, parasites, and even sunlight.
* Camouflage: The color and pattern of fur can help mammals blend in with their surroundings.
* Communication: Fur can be used for signaling, such as during courtship or territorial displays.